The notice said that the meeting would begin precisely at 9.00 a.m.

The correct answer is C. The notice said that the meeting would begin precisely at 9.00 a.m., which means that it would begin exactly at that time. This is the opposite of inaccurately, which means that the meeting would not begin at the time specified. The other options, concisely and approximately, are not accurate descriptions of the notice. Concisely means that the notice was brief, but it does not say anything about the time of the meeting. Approximately means that the meeting would begin at around 9.00 a.m., but it does not say that it would begin exactly at that time.